Ion selective measurements
First Claim
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1. Apparatus for use in measuring for the presence of selected ions comprising:
- electrolyte container arranged to contain a body of electrolyte;
a reference electrode;
an ion selective electrode including an ion selective element;
a standard solution container;
a sample solution container;
each of said standard solution container and said sample solution container including an ionic bridge element extending through its wall; and
holding means for holding said ion selective element and said reference electrode and the bridge elements in said electrolyte container such as to be immersed in the body of electrolyte when contained in said electrolyte container.
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Abstract
A reference electrode (102), standard calibration solutions (72 and 76) and a sample solution (80) are all placed in liquid contact with one another and a reference solution (70). Contact between the reference solution (70), the sample (80) and the calibration solutions (72 and 76) is made through salt bridges (82, 74 and 78). A special conical shaped solution container (FIG. 5) having a porous plug or other salt bridge extending through the container wall at the apex provides special advantage.
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Citations
23 Claims
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1. Apparatus for use in measuring for the presence of selected ions comprising:
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electrolyte container arranged to contain a body of electrolyte; a reference electrode; an ion selective electrode including an ion selective element; a standard solution container; a sample solution container; each of said standard solution container and said sample solution container including an ionic bridge element extending through its wall; and holding means for holding said ion selective element and said reference electrode and the bridge elements in said electrolyte container such as to be immersed in the body of electrolyte when contained in said electrolyte container. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 22, 23)
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11. In combination:
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an ion selective electrode having an ion selective element; a reference electrode; a first standard solution container having a salt bridge extending through its wall; a sample solution container having a salt bridge extending through its wall; and holding means for holding said ion selective element and said reference electrode and said salt bridges in intimate contact with a body of electrolyte. - View Dependent Claims (12, 13, 14, 15)
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16. The method of conducting tests to determine ion content in a sample fluid using a voltmeter connected between a reference electrode and an ion selective electrode, which method comprises the steps of:
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immersing the reference electrode in a body of electrolyte; placing a standard calibrating solution and a sample solution in intimate liquid contact with one another and with said reference electrode in said electrolyte through a salt bridge; placing the ion selective electrode in the standard calibrating solution and calibrating the voltmeter; and placing the ion selective electrode in the sample solution. - View Dependent Claims (17, 18, 19, 20, 21)
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Specification